Patents by Inventor Stewart Forsyth

Stewart Forsyth has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20250136561
    Abstract: A new composition of matter has the molecular structure [I]: Formula (I) wherein R1 is an alkyl, cycloalkyl, aralkyl group having ?1 to ?10 carbon atoms; R2 is selected from the group consisting of an aliphatic C1-C10 group, an unsaturated C1-C10 chain, C4-C9 group with a cyclic portion and C4-C10 group with an aromatic portion, and combinations thereof; R3 is selected from the group consisting of hydrogen, an aliphatic C1-C10 group, an unsaturated C2-C10 chain, a C4-C10 group with a cyclic portion, C4-C10 group with an aromatic portion, and combinations thereof; and R4 is a terminal functional group selected from the group consisting of amide [—CONH2], acid [—COOH], amine [—CH2—NH2], guanamine [—(C3N3)—(NH2)2], organic heterocyclic [—CHN4], and combinations thereof; and wherein said composition of matter of the molecular structure [I] excludes 2-[(3-amino-1-ethylpropyl)amino]ethanol.
    Type: Application
    Filed: September 21, 2021
    Publication date: May 1, 2025
    Inventors: Stewart Forsyth, Isaac K. Iverson, Ameena Mitha, Eric Robert Sirianni
  • Publication number: 20160200586
    Abstract: The invention provides an oxygen Andrussow process for production of hydrogen cyanide from a methane-containing feedstock such as natural gas in the presence of oxygen and ammonia over a platinum catalyst, wherein the production of byproduct organonitrile impurities, such as acrylonitrile, is reduced. Limiting the content of C2 hydrocarbons in the methane feedstock in the oxygen Andrussow process, in contrast to the air Andrussow process, has been found to reduce formation of organonitriles, such as acrylonitrile. The organonitrile impurities can require additional processing for removal cause fouling of equipment, and can also contribute to hydrogen cyanide polymerization. Reduction of C2+ hydrocarbon levels to less than 2 wt %, or 1 wt %, or less than 0.1 wt %, in the methane can provide an improved yield of higher purity HCN.
    Type: Application
    Filed: December 12, 2013
    Publication date: July 14, 2016
    Applicant: INVISTA TECHNOLOGIES S.A R.L.
    Inventors: Stewart FORSYTH, Aiguo LIU, Martin J. RENNER, Brent J. STAHLMAN
  • Publication number: 20160046497
    Abstract: A process for the production of hydrogen cyanide comprises feeding a reaction mixture feed to a plurality of primary reactors each comprising a catalyst bed comprising platinum, wherein the reaction mixture feed comprises gaseous ammonia, methane, and oxygen gas, determining whether a percent yield of hydrogen cyanide in any of the plurality of primary reactors is at or below a threshold, identifying one or more suboptimal reactors amongst the plurality of primary reactors when the percent yield of hydrogen cyanide in any of the plurality of primary reactors is at or below the threshold, and supplementally feeding the reaction mixture feed to one or more supplementary reactors when the one or more suboptimal reactors are identified, wherein each of the one or more supplementary reactors comprises a catalyst bed comprising platinum.
    Type: Application
    Filed: December 12, 2013
    Publication date: February 18, 2016
    Applicant: INVISTA NORTH AMERICA S.A R.L.
    Inventors: Stewart FORSYTH, Aiguo LIU, Martin J. RENNER, Brent J. STAHLMAN
  • Publication number: 20160046499
    Abstract: Processes and systems for the production of hydrogen cyanide via the Andrussow process are described. A reaction zone, wherein oxygen, ammonia, and methane can be allowed to react in the presence of a catalyst comprising platinum to provide hydrogen cyanide. A desulfurization zone, wherein a feed stream comprising sulfur and at least one of the oxygen, the ammonia, and the methane can be contacted with a desulfurization material to produce a sulfur-reduced feed stream that is provided to the reaction zone. In an example, the desulfurization material includes zinc oxide.
    Type: Application
    Filed: December 12, 2013
    Publication date: February 18, 2016
    Applicant: INVISTA NORTH AMERICA S.A R.L.
    Inventors: Stewart FORSYTH, Aiguo LIU, Martin J. RENNER, Brent J. STAHLMAN
  • Patent number: 9221852
    Abstract: Claimed is a process for producing a phosphorus-containing ligand, preferably a diphosphite ligand structure (DLS) such as structure I. The method includes contacting a phosphorochloridite (structure II) with a compound having the structure X—OH (which can be a bisaryl compound), and a tertiary organic amine to provide structure I? and as preferred embodiment structure I.
    Type: Grant
    Filed: October 15, 2012
    Date of Patent: December 29, 2015
    Assignee: INVISTA North America S.a.r.l.
    Inventors: Stewart Forsyth, John Arthur Turner, Keith Whiston, Thomas E Vos
  • Publication number: 20150360965
    Abstract: The system and methods described herein solve problems of inaccurate flow control, loss of optimum reactant gas feed ratios, and the associated inefficiencies brought on by variable humidity in reactant feedstream gases during production of hydrogen cyanide by an Andrussow process.
    Type: Application
    Filed: December 12, 2013
    Publication date: December 17, 2015
    Applicants: INVISTA TECHNOLOGIES S.A.R.L., INVISTA NORTH AMERICA S.A.R.L.
    Inventors: Stewart FORSYTH, Aiguo LIU, Martin J. RENNER, Brent J. STAHLMAN
  • Publication number: 20150352481
    Abstract: A method and a system for recovering hydrogen from a process for making hydrogen cyanide are described herein. In the method, hydrogen is recovered from a gaseous waste stream of an Andrussow process. The method comprises the following steps: (a) adjusting a reaction mixture comprising methane, ammonia and oxygen to provide the reaction mixture with sufficient oxygen to generate a gaseous waste stream that has at least 40% hydrogen after removal of ammonia and recovery of hydrogen cyanide; and (b) removing components from the gaseous waste stream to generate recovered hydrogen.
    Type: Application
    Filed: December 12, 2013
    Publication date: December 10, 2015
    Applicant: INVISTA NORTH AMERICA S.A R.L.
    Inventors: Stewart FORSYTH, Aiguo LIU, Martin J. RENNER, Brent J. STAHLMAN
  • Publication number: 20140343313
    Abstract: Claimed is a process for producing a phosphorus-containing ligand, preferably a diphosphite ligand structure (DLS) such as structure I. The method includes contacting a phosphorochloridite (structure II) with a compound having the structure X—OH (which can be a bisaryl compound), and a tertiary organic amine to provide structure I? and as preferred embodiment structure I.
    Type: Application
    Filed: October 15, 2012
    Publication date: November 20, 2014
    Applicant: INVISTA North America S.a r.l.
    Inventors: Stewart Forsyth, John Arthur Turner, Keith Whiston, Thomas E. Voss
  • Patent number: 8686134
    Abstract: The invention relates to an ionic liquid composition and a method for preparing the ionic liquid. The ionic liquid comprises a cation containing the Formula I, as herein disclosed, and wherein: n is 2, R1 is selected from the group consisting of: H, C1-C12 alkyl, aryl or together with R2 may form a heterocyclic ring, and R2 is selected from the group consisting of: H, C1-C12 alkyl, aryl or together with R1 may form a heterocyclic ring, and R3 is selected from the group consisting of hydrogen and C1-C12 alkyl, and wherein R1 and R2 are not simultaneously selected from hydrogen.
    Type: Grant
    Filed: July 20, 2011
    Date of Patent: April 1, 2014
    Assignee: Invista North America S.A R.L.
    Inventors: Stewart Forsyth, Kenneth Richard Seddon, Keith Whiston
  • Patent number: 8609572
    Abstract: Use of ionic liquids as solvents in base-catalysed chemical reactions wherein the ionic liquid is composed of at least one species of cation and at least one species of anion, characterized in that a cation of the ionic liquid comprises a positively charge moiety and a basic moiety, and further wherein such ionic liquids may be used as promoters or catalysts for the chemical reactions.
    Type: Grant
    Filed: January 4, 2006
    Date of Patent: December 17, 2013
    Assignee: The Queen's University of Belfast
    Inventors: Martyn J. Earl, Kenneth R. Seddon, Stewart Forsyth, Ute Frohlich, Nimal Gunaratne, Suhas Katdare
  • Publication number: 20120190844
    Abstract: The invention relates to an ionic liquid composition and a method for preparing the ionic liquid. The ionic liquid comprises a cation containing the Formula I, as herein disclosed, and wherein: n is 2, R1 is selected from the group consisting of: H, C1-C12 alkyl, aryl or together with R2 may form a heterocyclic ring, and R2 is selected from the group consisting of: H, C1-C12 alkyl, aryl or together with R1 may form a heterocyclic ring, and R3 is selected from the group consisting of hydrogen and C1-C12 alkyl, and wherein R1 and R2 are not simultaneously selected from hydrogen.
    Type: Application
    Filed: July 20, 2011
    Publication date: July 26, 2012
    Applicant: INVISTA North America S.a r.l.
    Inventors: Stewart Forsyth, Kenneth Richard Seddon, Keith Whiston
  • Patent number: 8088917
    Abstract: The invention relates to an ionic liquid composition and a method for preparing the ionic liquid. The ionic liquid comprises a cation containing the Formula I, as herein disclosed, and wherein: n is 2, R1 is selected from the group consisting of: H, C1-C12 alkyl, aryl or together with R2 may form a heterocyclic ring, and R2 is selected from the group consisting of: H, C1-C12 alkyl, aryl or together with R1 may form a heterocyclic ring, and R3 is selected from the group consisting of hydrogen and C1-C12 alkyl, and wherein R1 and R2 are not simultaneously selected from hydrogen.
    Type: Grant
    Filed: May 29, 2008
    Date of Patent: January 3, 2012
    Assignee: Invista North America S.A R.L.
    Inventors: Stewart Forsyth, Kenneth R. Seddon, Keith Whiston, Sudhir Aki
  • Patent number: 7772293
    Abstract: An improved process for the hydrolysis of nylon polymer is herein disclosed using ionic liquids and optionally one equivalent of sulfuric acid per amide residue of the polymer. The process provides for a simplified means for separation of the hydrolyzed polyamide constituent monomers.
    Type: Grant
    Filed: July 30, 2008
    Date of Patent: August 10, 2010
    Assignee: Invista North America S.A.R.L.
    Inventors: Keith Whiston, Stewart Forsyth, Kenneth R. Seddon
  • Publication number: 20090270248
    Abstract: Use of ionic liquids as solvents in base-catalysed chemical reactions wherein the ionic liquid is composed of at least one species of cation and at least one species of anion, characterised in that a cation of the ionic liquid comprises a positively charge moiety and a basic moiety, and further wherein such ionic liquids may be used as promoters or catalysts for the chemical reactions.
    Type: Application
    Filed: January 4, 2006
    Publication date: October 29, 2009
    Applicant: The Queen's University of Belfast
    Inventors: Martyn John Earl, Kenneth Richard Seddon, Stewart Forsyth, Ute Frohlich, Nimal Gunaratne, Suhas Katdare
  • Publication number: 20090036602
    Abstract: An improved process for the hydrolysis of nylon polymer is herein disclosed using ionic liquids and optionally one equivalent of sulfuric acid per amide residue of the polymer. The process provides for a simplified means for separation of the hydrolyzed polyamide constituent monomers.
    Type: Application
    Filed: July 30, 2008
    Publication date: February 5, 2009
    Applicant: INVISTA NORTH AMERICA S.A R.L.
    Inventors: KEITH WHISTON, STEWART FORSYTH, KENNETH R. SEDDON
  • Publication number: 20080296531
    Abstract: The invention relates to an ionic liquid composition and a method for preparing the ionic liquid. The ionic liquid comprises a cation containing the Formula I, as herein disclosed, and wherein: n is 1 or 2, R1 is selected from the group consisting of: H, C1-C12 alkyl, aryl or together with R2 may form a heterocyclic ring, and R2 is selected from the group consisting of: H, C1-C12 alkyl, aryl or together with R1 may form a heterocyclic ring, and R3 is selected from the group consisting of hydrogen and C1-C12 alkyl, wherein if n is 1, then R3 is C1-C12 alkyl; and wherein R1 and R2 are not simultaneously selected from hydrogen. The method for the preparation of the ionic liquid composition provided herein starts with at least one N-substitution of the compound of Formula II, as herein disclosed, and wherein: n is 1 or 2, R3 is selected from the group consisting of hydrogen and C1-C12 alkyl, wherein if n is 1, then R3 is C1-C12 alkyl.
    Type: Application
    Filed: May 29, 2008
    Publication date: December 4, 2008
    Applicant: INVISTA NORTH AMERICA S.A R.L.
    Inventors: Keith Whiston, STEWART FORSYTH, Kenneth R. Seddon
  • Publication number: 20070215300
    Abstract: A method for the treatment of a lignin-containing material such as wood pulp, bagasse and other plant-derived materials, comprising contacting the lignin-containing material with an ionic liquid to extract the lignin therefrom. The ionic liquid is suitably a substituted or unsubstituted imidazolium, triazolium, pyrazolium, pyridinium, pyrrolidinium, piperidinium, ammonium, phosphonium or sulfonium salt of a substituted or unsubstituted aryl sulfonate, such as an ionic liquid salt of a xylene sulfonate.
    Type: Application
    Filed: August 13, 2004
    Publication date: September 20, 2007
    Inventors: Jonathan Upfal, Douglas MacFarlane, Stewart Forsyth
  • Publication number: 20060210873
    Abstract: Pyrrolidinium based room temperature ionic liquids, and phosphorous and arsenic analogues, are used as electrolytes in energy storage devices including secondary lithium batteries, supercapacitors and asymmetric battery-supercapacitors. The electrolytes preferably contain lithium ions as the charge-carrying species. The electrolytes are in a liquid state at the operating temperature.
    Type: Application
    Filed: March 2, 2004
    Publication date: September 21, 2006
    Applicant: MONASH UNIVERSITY
    Inventors: Anthony Hollenkamp, Patrick Howlett, Douglas MacFarlane, Stewart Forsyth